It will depend on the context. If the words are said by a parent reminding a child that they did not say 'please' or 'thank you' or something similar, then I don't feel any real difference.
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dimsumexpressFirst of all, I believe this should be: Did you forget something? , rather than "didn't you forget something?"In the context I suggested, 'didn't' is probably more natural, in British English at least. It functions more as a reminder than an enquiry.
dimsumexpressYes, there are differences. "Did" applies to the past cont